Born in 1864 in Swansea, Wales to a family of French aristocrats, Belleroche spent most of his childhood in Paris. Here he began his artistic career in 1882, first studying briefly with Carolus-Duran, Paris's leading portrait painter of the time. He befriended and traveled with one of Duran's former students, American expatriate, John Singer Sargent. He also met and shared a model with fellow aristocrat and printmaker Henri de Toulouse-Lautrec in 1864. He was primarily trained as a painter, but Belleroche excelled as a printmaker. His technique and understanding of lithography was said to have been unmatched.